US2381102A - Flexible adapter - Google Patents
Flexible adapter Download PDFInfo
- Publication number
- US2381102A US2381102A US506013A US50601343A US2381102A US 2381102 A US2381102 A US 2381102A US 506013 A US506013 A US 506013A US 50601343 A US50601343 A US 50601343A US 2381102 A US2381102 A US 2381102A
- Authority
- US
- United States
- Prior art keywords
- tool
- driven
- drill
- driving
- adapter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
- F16D3/202—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints
- F16D3/205—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part
- F16D3/2052—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part having two pins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/08—Chucks holding tools yieldably
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T279/00—Chucks or sockets
- Y10T279/17—Socket type
- Y10T279/17017—Self-centering of floating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/65—Means to drive tool
- Y10T408/665—Universal or flexible drive connection to rotate Tool
Definitions
- drilling jigs which comprise a relatively heavy plate having holes drilled therethrough in the patterns in which the work is to be drilled, the jig being positioned against the work.
- the holes in the jig are usually furnished with steel bushings to prevent wear of the holes in the jig.
- the length of the hole usually is several times the diameter of the hole in the smaller drill sizes.
- a very slight angularity of' bind the bit skew the drill in the jig and work and break the drill.
- the general object of the invention is to provide an adapter or separate fitting which may be readily applied to an electric drill or similar power tool when work is to be done which may result in adapter, thus avoiding jamming of the tool in the jig and/or work and breakage of the tool.
- Yet another object or the invention is to pro-.
- Figure 1 is a side view. partly in section showing a drill fitted with the adapter in operation.
- An object of the invention is to provide a flex ible adapter for power driven hand tools such as electric drills, which can be mounted in the chuck of the tool as easily as the bit, the bit itself being mounted in the work face of .the
- a further object of the invention is to provide a flexible adapter which is simple and inexpensive to construct and without readily separable parts when assembled.
- a still further object o! the invention is to provide a flexible adapter in which the pressure exerted by the operator is transmitted solidly to the tool while the latter is cutting through the work but if a lateral force between the tool and the tool motor is set up, as when the tool pierces the work,
- FIG. 2 is a plan view similar to Figure l but showing the drill motor exerting a skewing pres.- sure onthe drill after the drill has pierced the work.
- the numeral ll indicates the chuck of a drill motor in whichth'e flexible adapter llis mounted.
- a snake drill bit I! is threaded into a tapped bore H in the work face ll of the adapter.
- the member It has an-easy sliding lit in shell It and is limited in its longitudinal movement therein by' a ring 22 fitted closely into a circumferential groove 24 in the work head l9 and projecting into a wide circumferential groove formed in the inner periphery of the forward end of the shell.
- the inner member I8 is normally held in outward position by a spring 28, preferablyso that the work head I! projects from the outer end 01 the shell.
- the spring 28 is held under compression between the inner end of the tubular portion 20 of the inner member l8. and the inwardly turned inner end 32 01' the outer shell it.
- adapter comprises at. outer' v ward side against washer 36.
- Ball 3 3 is thus h'eld against longitudinal movement in the inner member iii but is free to rock relatively to the 1011-' gitudinal axis of said member.
- a snake drill bit has been shown mounmd in the work head as a matter of illustration only.
- an adapter plug threaded at one end to fit the threaded bore in the work head, and threaded to fit a chuck at the other end or furnished with a taper to fit a chuck having a tapered 'bore, a variety of tools may be used with the adapter.
- the adapter provides a good bearing surface for the transmission of pressure from the drill motor handle through the drill chuck iii and ball headed member E i to the ball socket d of the work head is and to the drill stem threaded therein.
- Spring 28 exerts a considerable centering effort on the assembly and the construction therefore gives the operator the feeling of a solid drive combined with a feeling of axial disalinement when the axis of the drill motor' is not in line with that of the drill bit.
- a flexible coupling for a power driven hand tool including an annular shoulder symmetrically disposed relative to the operative axis of the tool comprising: a driving member held in the motor unit and driven by the tool motor; a driven member comprising a cylindrical part provided at one end with means to hold an operative tool and with thrust transmitting universal joint elements at the opposite end; thrust transmitting universal joint elements on the end of said driving member cooperating with the universal Joint elements on said driven member; means holding said driving and driven members against separation; a tubular member surrounding said driven member and in guiding and limited sliding engagement therewith and carrying an inwardly projecting abutment; and resilient means held under compression and positioned between the driven member and the abutment on said tubular member and acting to hold one end of said tubular member a ainst said annular shoulder, said resiliient means serving to maintain the driving and driven member in axial alignment to transmit thrust exerted by the operator from the motor unit to the: tool operated thereby during normal operation during which the annular shoulder is in symmetrical engagement with the end
- a flexible coupling for a power driven ind tool including an annular shoulder symmetrically disposed relative to the operative axis of the 001 comprising: a driving member having a rem mounted in the chuck or said tool and haw 1g a spherical surface at its head end; pins projecting laterally and radially from said driving member; a cylindrical driven member provided with a seat to receive the spherical head of the driving member and with slots to receive the pins projecting from said drivin member; retaining means acting to prevent separation of said spherical surface of the driving member from the seat in the driven member while permitting rocking movement in all directions of said driven member relatively to said driving member; a tubular member surrounding said driven member and in guiding and limited sliding engagement therewith and carrying an inwardly projecting abutment; and resilient means held under compression and positioned between the driven member driven member and the abutment onjs'aid tubular member and acting to hold one endbt said tubu lar member against said annular '
- a flexible coupling for a power driven hand tool including an annular shoulder symmetrically disposed relative to the operative axis of the tool comprising: a driving member having a stem mounted in the chuck of said tool and having a spherical surface at its head end; pins projecting laterally and radially from said driving member; a cylindrical driven member provided with a seat to receive the spherical head of the driving member and with slots to receive the pins projecting from said driving member; retaining means acting to prevent separation of said spherical surface of the driving member from the seat in the driven member while permitting rocking movement in all directions of said driven member relatively to said driving member; a tubular member surroundin said driven and driving member and in sliding engagement with said driven member; a lock ring mounted in the periphery of said driven member and received in a peripheral groove in the inner surface of said tubular member, said groove being sufand acting to hold one end of said tubular member against said annular shoulder, said resilient means serving to maintain the driving and driven member in axial alignment
- a flexible driving connection between the motor unit and the tool or a power driven hand tool comprising: a driving member held in said motor unit and driven by said tool motor; a driven member coaxial with said driving member and arranged to hold a tool; a universal joint connection between said driving and driven members; means for maintaining said universal joint elements in engagement; a tubular member in which said driving and driven members are nested and having a guiding and limited sliding engagement with said driven member; and resilient means under compression arranged between said driven member and tubular member and acting to hold the end of said tubular member against an annular surface associated with said motor unit and symmetrically disposed relative to the operative axis of the tool.
Description
Filed Oct. 12, 1943 ATTORNEY Patented Aug; 7
stir Eric;
astute Leo a. Boyd, Gama, cant, assignor to nominal hirer-sift Company, fine, Santa. Monica,
Application some 112, was, semi s his Claims. (clea -ii the lateral force on the bit is taken up by the This invention relates to an adapter designed to be used with power driven hand tools and particularly with electric drills. I
The hard steel of-which drills are made is relatively brittle and little lateral pressure is required to'break them. The cost of new drill bits and the time lost by the operator in removing the broken drill, drawing a, new drill bit' from the tool crib and inserting the new drill bit, represents a serious additional expense apart from the danger of marring the holeor work piece as can easily happen when-drilling the/ thinner gauges of metal without the use of a jig. I
Much of the hand drilling in mass production is done with drilling jigs which comprise a relatively heavy plate having holes drilled therethrough in the patterns in which the work is to be drilled, the jig being positioned against the work. The holes in the jig are usually furnished with steel bushings to prevent wear of the holes in the jig. Thus the length of the hole usually is several times the diameter of the hole in the smaller drill sizes. A very slight angularity of' bind the bit skew the drill in the jig and work and break the drill.
The general object of the invention is to provide an adapter or separate fitting which may be readily applied to an electric drill or similar power tool when work is to be done which may result in adapter, thus avoiding jamming of the tool in the jig and/or work and breakage of the tool.
Yet another object or the invention is to pro-.
vide a flexible adapter which may be readily fitted for use with diilerent types of drills or other tools.
' Still further features of the invention mayappear from the following specification and/or accompanying illustrative drawing. It isjto be.
understood that the scope of the invention is not in any way limited by the described emb'odi mentor the invention but only as defined by the scope or the appended claims.
In the drawing; in which identical numerals indicate identical parts,
Figure 1 is a side view. partly in section showing a drill fitted with the adapter in operation.
breakage due to the circumstances above discussed. An object of the inventionis to provide a flex ible adapter for power driven hand tools such as electric drills, which can be mounted in the chuck of the tool as easily as the bit, the bit itself being mounted in the work face of .the
adapter. A
A further object of the invention is to provide a flexible adapter which is simple and inexpensive to construct and without readily separable parts when assembled.
A still further object o! the invention is to provide a flexible adapter in which the pressure exerted by the operator is transmitted solidly to the tool while the latter is cutting through the work but if a lateral force between the tool and the tool motor is set up, as when the tool pierces the work,
-Fig ure 2 is a plan view similar to Figure l but showing the drill motor exerting a skewing pres.- sure onthe drill after the drill has pierced the work. i
In Figure l the numeral ll indicates the chuck of a drill motor in whichth'e flexible adapter llis mounted. A snake drill bit I! is threaded into a tapped bore H in the work face ll of the adapter.
The body. of the shell l6, and an inner member it formed with a work head 19 at one end of the adapter, and a tubular rearwardlyextending portion 20. The member It has an-easy sliding lit in shell It and is limited in its longitudinal movement therein by' a ring 22 fitted closely into a circumferential groove 24 in the work head l9 and projecting into a wide circumferential groove formed in the inner periphery of the forward end of the shell. The inner member I8 is normally held in outward position by a spring 28, preferablyso that the work head I! projects from the outer end 01 the shell. The spring 28 is held under compression between the inner end of the tubular portion 20 of the inner member l8. and the inwardly turned inner end 32 01' the outer shell it.
adapter comprises at. outer' v ward side against washer 36. Ball 3 3 is thus h'eld against longitudinal movement in the inner member iii but is free to rock relatively to the 1011-' gitudinal axis of said member.
It is pointed out that a snake drill bit has been shown mounmd in the work head as a matter of illustration only. By screwing in an adapter plug threaded at one end to fit the threaded bore in the work head, and threaded to fit a chuck at the other end or furnished with a taper to fit a chuck having a tapered 'bore, a variety of tools may be used with the adapter.
It will be noted that the adapter provides a good bearing surface for the transmission of pressure from the drill motor handle through the drill chuck iii and ball headed member E i to the ball socket d of the work head is and to the drill stem threaded therein. Spring 28 exerts a considerable centering effort on the assembly and the construction therefore gives the operator the feeling of a solid drive combined with a feeling of axial disalinement when the axis of the drill motor' is not in line with that of the drill bit.
When the resistance of the material being drilled is suddenly removed the jar is liable to cause an inexperienced operator to momentarily move the motor laterally to a slight extent, resulting in the jamming of the drill in the drill jig and drill hole. In a tool provided with the adapter of this invention the angular movement of the motor is permitted by the rocking of the ball shaped member, as shown in Figure 2, this movement being permitted by the sliding of the outer shell l8 over the inner member I 8 within the limit of travel movement permitted by locking ring 22 in the wide slot 26, and against the pressure exerted by the spring 28. The described movement of the- Darts minimizes transference of lateral thrust to the drill stem and therefore avoids Jamming of the drill bit.
Various modificationsmay bemade in the flexible adapter of this invention by those skilled in the art without de arting from the scope or the tool; universal Joint elements between said driving and driven members; means holding said driving and driven members against separation: a tubular member surrounding said driven member and in guiding and limited sliding engagement therewith; an inwardly projecting abutment carried by said' tubular member; and resilient means held under compression and positioned-between the.
in symmetrical engagement with the end of the tubular member, but permitting tilting of the motor unit and annular shoulder, to occur relatively to the axial line 01 the-foperative tool, by
displacement oi the tubular member, due to the consequent tilted relation of thoannular shoulder to the end of the tubular member by sliding over the driving member against the resistance of the resilient means, thus minimizing lateral thrust on the operative tool.
2. A flexible coupling for a power driven hand tool including an annular shoulder symmetrically disposed relative to the operative axis of the tool comprising: a driving member held in the motor unit and driven by the tool motor; a driven member comprising a cylindrical part provided at one end with means to hold an operative tool and with thrust transmitting universal joint elements at the opposite end; thrust transmitting universal joint elements on the end of said driving member cooperating with the universal Joint elements on said driven member; means holding said driving and driven members against separation; a tubular member surrounding said driven member and in guiding and limited sliding engagement therewith and carrying an inwardly projecting abutment; and resilient means held under compression and positioned between the driven member and the abutment on said tubular member and acting to hold one end of said tubular member a ainst said annular shoulder, said resiliient means serving to maintain the driving and driven member in axial alignment to transmit thrust exerted by the operator from the motor unit to the: tool operated thereby during normal operation during which the annular shoulder is in symmetrical engagement with the end of the tubular member, but permitting tilting of the motor unit and annular shoulinvention as defined by the scope of the appended operative tool, by displacement of th'e tubular member, due to the consequent tilted relation of theannular shoulder to the end of the tubular member by sliding over the driving member against the resistance of the resilient means, thus minimizing lateral thrust on the operative tool.
3. A flexible coupling for a power driven ind tool including an annular shoulder symmetrically disposed relative to the operative axis of the 001 comprising: a driving member having a rem mounted in the chuck or said tool and haw 1g a spherical surface at its head end; pins projecting laterally and radially from said driving member; a cylindrical driven member provided with a seat to receive the spherical head of the driving member and with slots to receive the pins projecting from said drivin member; retaining means acting to prevent separation of said spherical surface of the driving member from the seat in the driven member while permitting rocking movement in all directions of said driven member relatively to said driving member; a tubular member surrounding said driven member and in guiding and limited sliding engagement therewith and carrying an inwardly projecting abutment; and resilient means held under compression and positioned between the driven member driven member and the abutment onjs'aid tubular member and acting to hold one endbt said tubu lar member against said annular 'shoulder said resilient means serving to maintain the driving and driven member in axial alignment to transmit thrust exerted by the operator from the motor unit to the tool operated thereby during'normal operation during which the annular shoulder is and the abutment on said tubular member and acting to hold one end of said tubular member against said annular shoulder, said resilient means serving to maintain the driving and driven member in axial alignment to transmit thrust exerted by the operator from the motor unit to the tool operated thereby during normal operation during which the annular shoulder is in I symmetrical engagement with the end 01' the resilient means, thus minimizing lateral thrust on the operative tool.
4. A flexible coupling for a power driven hand tool including an annular shoulder symmetrically disposed relative to the operative axis of the tool comprising: a driving member having a stem mounted in the chuck of said tool and having a spherical surface at its head end; pins projecting laterally and radially from said driving member; a cylindrical driven member provided with a seat to receive the spherical head of the driving member and with slots to receive the pins projecting from said driving member; retaining means acting to prevent separation of said spherical surface of the driving member from the seat in the driven member while permitting rocking movement in all directions of said driven member relatively to said driving member; a tubular member surroundin said driven and driving member and in sliding engagement with said driven member; a lock ring mounted in the periphery of said driven member and received in a peripheral groove in the inner surface of said tubular member, said groove being sufand acting to hold one end of said tubular member against said annular shoulder, said resilient means serving to maintain the driving and driven member in axial alignment to transmit thrust exerted by the operator from the motor unit to the tool operated thereby during-normal operation during which the annular shoulder is in symmetrical engagement with the end of the tubular member, but permitting tilting to an extent limited by the stem of the driving member of the motor unit and annular shoulder, to occur relatively to the axial line of the operative tool, by displacement" of the tubular member, due to the consequent tilted relation of the annular shoulder to the end of the tubular member by sliding over the driving member against the re-. sistance of the resilient means, thus minimizing lateral thrust on the operative ml.
5. A flexible driving connection between the motor unit and the tool or a power driven hand tool comprising: a driving member held in said motor unit and driven by said tool motor; a driven member coaxial with said driving member and arranged to hold a tool; a universal joint connection between said driving and driven members; means for maintaining said universal joint elements in engagement; a tubular member in which said driving and driven members are nested and having a guiding and limited sliding engagement with said driven member; and resilient means under compression arranged between said driven member and tubular member and acting to hold the end of said tubular member against an annular surface associated with said motor unit and symmetrically disposed relative to the operative axis of the tool.
LEO B. YBOYD.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US506013A US2381102A (en) | 1943-10-12 | 1943-10-12 | Flexible adapter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US506013A US2381102A (en) | 1943-10-12 | 1943-10-12 | Flexible adapter |
Publications (1)
Publication Number | Publication Date |
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US2381102A true US2381102A (en) | 1945-08-07 |
Family
ID=24012802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US506013A Expired - Lifetime US2381102A (en) | 1943-10-12 | 1943-10-12 | Flexible adapter |
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US (1) | US2381102A (en) |
Cited By (50)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2508459A (en) * | 1948-08-31 | 1950-05-23 | Bayside Watch Tool Company Inc | Tool chuck |
US2718380A (en) * | 1951-11-09 | 1955-09-20 | Jeffrey Mfg Co | Flexible auger socket |
US2718381A (en) * | 1952-06-20 | 1955-09-20 | Jeffrey Mfg Co | Auger socket |
US2784573A (en) * | 1954-06-11 | 1957-03-12 | Victor T Wiglesworth | Universal joints and adjustments |
US2872900A (en) * | 1957-08-22 | 1959-02-10 | Merz Henry | Power operated drawing-lead sharpener |
US2912837A (en) * | 1958-01-20 | 1959-11-17 | Harper Wyman Co | Gas valve stem construction |
US3017052A (en) * | 1958-01-10 | 1962-01-16 | Olympic Screw & Rivet Corp | Riveting tool |
US3037401A (en) * | 1959-04-06 | 1962-06-05 | Reed Roller Bit Co | Self-aligning attachment for countersinking apparatus |
US3091102A (en) * | 1961-03-24 | 1963-05-28 | Dorothy E Linderme | Universal joint |
US3490546A (en) * | 1968-06-04 | 1970-01-20 | Robbins & Assoc James S | Drilling machine for use in small tunnels |
US3827510A (en) * | 1972-07-12 | 1974-08-06 | Rockwell International Corp | Power tool |
US4026125A (en) * | 1975-07-10 | 1977-05-31 | Patterson James T | Flexible drive adapter |
US4034574A (en) * | 1975-11-04 | 1977-07-12 | Frank A. Klaus | Universal ball and socket swivel joint |
US4184795A (en) * | 1978-03-01 | 1980-01-22 | Medlin Glenn D | Boring tool |
US4818155A (en) * | 1988-02-04 | 1989-04-04 | Macmuscle Co., Inc. | Power tool system including adapter and coupling member therefor |
US4870730A (en) * | 1987-10-13 | 1989-10-03 | Belknap John C | Tool mounting construction |
US4971486A (en) * | 1987-02-13 | 1990-11-20 | Upat Gmbh & Co. | Undercutting drill |
US4984942A (en) * | 1990-06-04 | 1991-01-15 | Leonard Holtz | Tap wrench |
US5236289A (en) * | 1991-03-11 | 1993-08-17 | Othy, Inc. | Shielded universal joint, jointed tool and guided surgical drill |
US5730657A (en) * | 1997-03-20 | 1998-03-24 | General Motors Corporation | Shaft coupling |
US6146280A (en) * | 1995-09-29 | 2000-11-14 | Tri-Tech, Inc. | Spring biased universal joint |
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US20080183174A1 (en) * | 2006-12-11 | 2008-07-31 | Arthrosurface Incorporated | Retrograde resection apparatus and method |
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US20180117731A1 (en) * | 2016-09-09 | 2018-05-03 | Advanced Turbine Support, LLC | Industrial High Speed Micro Drill |
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-
1943
- 1943-10-12 US US506013A patent/US2381102A/en not_active Expired - Lifetime
Cited By (82)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2508459A (en) * | 1948-08-31 | 1950-05-23 | Bayside Watch Tool Company Inc | Tool chuck |
US2718380A (en) * | 1951-11-09 | 1955-09-20 | Jeffrey Mfg Co | Flexible auger socket |
US2718381A (en) * | 1952-06-20 | 1955-09-20 | Jeffrey Mfg Co | Auger socket |
US2784573A (en) * | 1954-06-11 | 1957-03-12 | Victor T Wiglesworth | Universal joints and adjustments |
US2872900A (en) * | 1957-08-22 | 1959-02-10 | Merz Henry | Power operated drawing-lead sharpener |
US3017052A (en) * | 1958-01-10 | 1962-01-16 | Olympic Screw & Rivet Corp | Riveting tool |
US2912837A (en) * | 1958-01-20 | 1959-11-17 | Harper Wyman Co | Gas valve stem construction |
US3037401A (en) * | 1959-04-06 | 1962-06-05 | Reed Roller Bit Co | Self-aligning attachment for countersinking apparatus |
US3091102A (en) * | 1961-03-24 | 1963-05-28 | Dorothy E Linderme | Universal joint |
US3490546A (en) * | 1968-06-04 | 1970-01-20 | Robbins & Assoc James S | Drilling machine for use in small tunnels |
US3827510A (en) * | 1972-07-12 | 1974-08-06 | Rockwell International Corp | Power tool |
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